摘要
在低硼势粉末法渗硼剂中加入适量的铬粉,于750℃对45钢进行交流电场增强渗硼,研究Cr对电场增强粉末法渗硼的影响。采用光学显微镜、X射线衍射仪和显微硬度计对渗层组织、厚度、相与显微硬度进行观察和分析。试验结果表明:采用含3%硼铁的渗剂,渗硼层为典型的锯齿状硼化物,主要为Fe2B相;当渗剂中加入微量铬粉时,最高硬度基本不变,渗层厚度增加,且在铬粉含量为0. 2%时达最厚,较不加铬粉的提高约80%,之后降低;当铬粉含量高于3%后,渗层的最高硬度降低;当加入的铬粉≥5%时,渗层表层还出现多种含铬相。
Alternating current field enhanced pack boriding( ACFEPB) was carried out for 45 steel at 750 ℃ with low boron potential boriding powder added with an appropriate amount of Cr powder,and the effect of Cr on the ACFEPB was studied. The microstructure,thickness,phases and microhardness of the borided layer were examined and analyzed by optical microscope,X-ray diffractometer and microhardness tester. The experimental results show that the borided layer obtained with the boriding powder containing 3% ferroboron is mainly saw-teeth-like Fe2B phase. When the boriding powder is added with a very small amount of Cr powder,the maximum hardness remains almost unchanged,while when adding 0. 2% Cr powder,the layer thickness increases and reaches the maximum which is about 80%increase compared with that without Cr addition. Along with further increase of the amount of Cr powder,the layer thickness decreases,and the maximum hardness of the borided layer starts to decrease when the amount of Cr powder is more than 3%. When the addition is ≥5%,various Cr-containing phases are also detected in the surface layer of the treated layer.
作者
程伟
谢飞
Cheng Wei;Xie Fei(Materials Science and Engineering School,Changzhou University,Changzhou Jiangsu 213164,China;Key Laboratory of Materials Surface Engineering of Jiangsu Province,Changzhou Jiangsu 213164,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第2期235-238,共4页
Heat Treatment of Metals
基金
国家自然科学基金(51171032)。
关键词
粉末法渗硼
铬粉
交流电场
渗层组织
显微硬度
pack boriding
chromium powder
alternating current field
layer microstructure
microhardness
